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r=2,5cm
L= phi × r2
= 3.14 . 2.5 . 2.5
= 19.625
lingkaran2 (yg diarsir)
d= 2.25 r= 1.125
L = phi × r2
= 3.14. 1.125 . 1.125
L = 3.9740625
persegi panjang
L = P×L
= 5. 8.25
= 41.25
luas daerah yang diarsir
L.persegi panjang - lingkaran1
=41.25 - 19.625
= 21.625 cm2